NEW YORK, April 28, 2014 - Lassina Zerbo, executive secretary of the Preparatory Commission for the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO), briefs journalists at the United Nations headquarters in New York, on April 28, 2014. Zerbo stated here on Monday that the CTBO international monitoring system is 90 percent complete, and stressed the importance of this system to the international community.

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